GB956445A - Automatic moisture content determination and control apparatus - Google Patents
Automatic moisture content determination and control apparatusInfo
- Publication number
- GB956445A GB956445A GB1667960A GB1667960A GB956445A GB 956445 A GB956445 A GB 956445A GB 1667960 A GB1667960 A GB 1667960A GB 1667960 A GB1667960 A GB 1667960A GB 956445 A GB956445 A GB 956445A
- Authority
- GB
- United Kingdom
- Prior art keywords
- waveguide
- moisture content
- detector
- signal
- motor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D22/00—Control of humidity
- G05D22/02—Control of humidity characterised by the use of electric means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N22/00—Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more
- G01N22/04—Investigating moisture content
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Electromagnetism (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Paper (AREA)
- Treatment Of Fiber Materials (AREA)
Abstract
956, 445. Determination of moisture content S. SASAKI. May 11, 1960, No.16679/60. Heading G1N. An arrangement for determining the moisture content of a material such as fibre, cloth, or pulp comprises a waveguide 4 Fig. 1, including a transverse passage d through which the material 5 is passed, an oscillator 2 feeding the waveguide and a metering device 8 in which the attenuation of the oscillator signal by the material is determined by comparing the signal from a detector h which may be a crystal, with the output from a detector f at the top end of a tuning waveguide 6. The waveguides have tuners 7 and 9 at their ends, and the strength of the input signal is adjustable by an attenuator 3. The waveguide 4 comprises a hinged top portion b and the opening area of the slot beneath the hinged portion may be adjusted. The slot is lined to prevent dust from entering the waveguide and to facilitate the smooth passage of the material. A waveguide with a lateral hole for testing a yarn is described with reference to Fig. 2 not shown. In a modified circuit arrangement described with reference to Fig. 4 (not shown) the detector outputs are supplied to a single meter through a differential D. C. amplifier, the output of which may control also a steam valve for control of the moisture content. In an arrangement, Fig. 5, a reference waveguide 27 and a measuring waveguide 28 are arranged between two magic -T devices 24, 25, the former of which is fed by an oscillator 2 and includes a transfer shutter 31 driven by a motor 23 whereby the signal is applied alternatively to the two waveguides. The system is made self balancing by a two phase motor 32 adjusting an attenuator 29, the direction being governed by the phase relation between a synchronising signal produced by a rotor 30 on motor 23 in an induction coil 36, applied to field winding 34, and the rectified envelope from detector H. The action is described with reference to waveforms Fig. 6 (not shown). Balancing motor 32 is made also to drive a recording potentiometer 38 and the output to recorder 19 is applied also to a controller 20 to correct for deviations. The selection of a suitable frequency is referred to, and an example is given. Reference has been directed by the Comptroller to Specification 887, 556.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1667960A GB956445A (en) | 1960-05-11 | 1960-05-11 | Automatic moisture content determination and control apparatus |
FR865003A FR1292164A (en) | 1960-05-11 | 1961-06-15 | Automatic device for the control and determination of the moisture content |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1667960A GB956445A (en) | 1960-05-11 | 1960-05-11 | Automatic moisture content determination and control apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
GB956445A true GB956445A (en) | 1964-04-29 |
Family
ID=10081688
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1667960A Expired GB956445A (en) | 1960-05-11 | 1960-05-11 | Automatic moisture content determination and control apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB956445A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3460031A (en) * | 1966-06-08 | 1969-08-05 | Industrial Nucleonics Corp | Microwave waveguide moisture measurement |
DE3012714A1 (en) * | 1979-04-11 | 1980-10-23 | British American Tobacco Co | Tobacco moisture content measuring appts. - has microwave signal generator with divider splitting signal onto two signal paths with test capacitor in one, and delay line in other path |
DE3407819C1 (en) * | 1984-03-02 | 1985-06-13 | B.A.T. Cigaretten-Fabriken Gmbh, 2000 Hamburg | Device for measuring the humidity of smoke materials |
-
1960
- 1960-05-11 GB GB1667960A patent/GB956445A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3460031A (en) * | 1966-06-08 | 1969-08-05 | Industrial Nucleonics Corp | Microwave waveguide moisture measurement |
DE3012714A1 (en) * | 1979-04-11 | 1980-10-23 | British American Tobacco Co | Tobacco moisture content measuring appts. - has microwave signal generator with divider splitting signal onto two signal paths with test capacitor in one, and delay line in other path |
DE3407819C1 (en) * | 1984-03-02 | 1985-06-13 | B.A.T. Cigaretten-Fabriken Gmbh, 2000 Hamburg | Device for measuring the humidity of smoke materials |
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